The few days before the network upfronts tend to be brutal for shows awaiting word on their futures, and this year is no different.NBC issued a flood of cancellations earlier in the week, and CBS joined the fray on Friday (May 10), dropping the ax on the only four scripted shows on which it had yet to make a call: veterans "CSI: NY" and "Rules of Engagement" and rookie dramas "Golden Boy" and "Vegas."None of those is terribly surprising. "CSI: NY," which ended its ninth season in February, was widely expected to be done. Most of the "Rules of Engagement" cast sought other work this pilot season. "Vegas" started well but was on a downward curve for most of the season, and "Golden Boy" never really caught on in the ratings.PICS 2012-13 canceled showsThe cutting of "Golden Boy" and "Vegas" means CBS will bring only one of its first-year shows, "Elementary," back for a second...